feat: Make typo factor configurable

Fixes https://github.com/valeriansaliou/sonic/issues/394.

server/src/config.rs

@@ -44,6 +44,7 @@ pub fn defaults_toml() -> &'static str {
     suggest_limit_maximum = 20
     list_limit_default = 100
     list_limit_maximum = 500
+    typo_factor_word_lengths = [4, 7, 10]
 
     [store.kv]
     path = "./data/store/kv/"